I had never heard of it either, but the code is JF1 which is on the fender tag, build sheet, and in Goviers' '72 - '74 Option Code Book pg 5. It is sort of a mint green, I can see a bit of it under the door sills and under the hood. Glad to know that I am not the only one to have never heard of it before either.
The car is a '73.
Thanks,
Jason